Ha ha ha, good one DBGXP
But in all seriousness, from independent testing I've seen, Dexcool is a very good "long" service coolant (it's color denoting the use of a type of chemistry used to enhance its service life that differs from green (typical, 3-year, and Japanese (blue 5-year) coolant which use different chemistry as well). But it seems to have had a bad history of associated issues like head gasket leaks initially on many GM V6s, and waterpump issues on both V6 and I4 engines in GM's lineup, and a common thread seems to be pushing that 5 year service interval. Most of the failures rarely happen before 3 years for example if they are dexcool associated, and typically happen around 5.
Now you have to remember, this is still a VERY small percentage of the dexcool running vehicles on the road today, but if it means flushing your coolant out every 4 years instead of 5, at about $20 a pop in coolant and distilled water or about $5/year, I consider it VERY cheap insurance.
Just my opinion, feel free to run your dexcool however long you like.
